Observation of the rare eta->e+e-e+e- decay with the KLOE experiment

2011/05/31 by The KLOE Collaboration, F. Ambrosino, A. Antonelli +87 · 1 citation
Physics and Astronomy · #hep-ex

paper · pdf · doi:10.1016/j.physletb.2011.07.033

published as Phys.Lett. B702 (2011) 324-328 · 12 pages, 3 figures, to be published on PLB

arxiv created 2011/10/21 · arxiv updated 2015/05/28

Abstract

We report the first observation of the rare eta->e+e-e+e- decay based on 1.7 fb^-1 collected by the KLOE experiment at the DAFNE phi-factory. The selection of the e+e-e+e- final state is fully inclusive of radiation. We have identified 362 +- 29 events resulting in a branching ratio of (2.4 +- 0.2_stat+bckg +- 0.1_syst) x 10^-5.

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